Daniel bull



9, e g mich tatie @anni ffice.

DANIEL BULL, OF AMBOY, ILLINOIS, ASSIGNR T0 ,IIIMSELF `AND J. B. i

BOOKER.

Letters .Patent No. 68,947, 'ated September 17, 1867.

IMPBOVBD DOOR AND BLIND-FASTENING.

ilgr tlgrhnle nflmh in in tigen intim; atentnnt making puri tf the samt.

'IO ALL WI-IOM IT MAY CONCERN:

Be it known that I, DANIIJL BULL, of Amboy, in the county of Lee, andState of Illinois, have invented a. new and improved Fastening forDouble Doors and Blinds; and I do hereby declare that the following isa. full, clear, and exact description thereof, reference being had tothe accompanying drawings, making a part'of this specification, inwhichp Figure 1 is an'elevation of double doors with parts broken awayto show the improved fastenings.

Figures 2 and 3 represent the construction of the bottom fastening.

Figures 4 and 5 represent the construction of the top fastening.

Similar letters of refer ence indicate corresponding parts in theseveral figures.

The object of this invention is to prevent the picking" ofbolt-fastenings of double doors, by so constructing a fastening thatwhen it is applied to one door, and both doors closed, the other doorwill lock and hold the fastening firmly in place, as will be hereinafterdescribed. Hithcrto double' doors have been secured when closed andlocked by means of bolts applied to thc upper and lower endsof o ne ofthe doors so as'to shoot into the sill and lintel. These bolt-fasteningsare very insecure and troublesomeyas they can be easily picked from theoutside, and thus allow both doors to bethrown open.

To enable others skilled in'the art to understand my invention, I willdescribe its construction and operation.- In the accompanying drawings Ihave represented two different forms of'fastenings appliedto the door A,

one of which may bc applied to the lintel B, and the othei` to thc lowerend of the door. The door A has any i.

of the well-known forms of locks applied to it in thel usual manner, soas to secure itV to the .door A when closed. The fastening which isrepresented at the .lower end of the door A, in iig. 1, and which isrepresented detached from the door, in figs. 2 and 3, consists of aright-angular plate 'or frame, a, which is recessed into the inner lowercorner of the door A so. as to be Hush with the edges thereof, as show nin iig. 1. Tothis frame a. a spring-latch, C, is applied, having adouble-bcvelled nose, b b', formed on` its lower projecting end, whichis adapted for springing. into a V shaped channelplate,-D, when the dooris closed. The laterally projecting portion b of the nose b projects a.shortidistance from the vertical portion of frame a, so that when bothdoors A A are closed, the door A will receive said portion b beneath-it,and thus prevent the latch from being raised out of its recess in plateD. The plate D is recessed into the door-sill flush with thesurfacethereof, and serves as a friction or wearing-plate for the noseof the latch. That portion of the lower edge of the door A whichreceives under it the latch portion I1 may be faced with metal, as shownat fin `iig. `1. The stem of latch C passes upward through a stud, d,and has a spring, g, -coiled around it for keeping the latch down ainplace and allowing it to spring upward, when the door is closed. A stud,g', is formed on the inner face of the lower portion of the latch, whichwill prevent the latter from being forced too far down or dropping outof its place. y

By inverting this-fastening, which Ihave above described, and applyingit to the upper corner of the door A, it will serve just as well forauf-upperfastening as for the 'lower fastening. In this case the latchwill bel locked in place when both doors are closed by the door Apassingbeneath the projecting portion of the nose b. In figs. 4 and '5 I haverepresented a fastening, which is'designed particularly for the upperportion of the door A. This fastening is recessed into the bottom faceof the lintel, as shown in g.1, and has a. doublebevel nose, h, formedon its lower end, which catches into a. recessed plate, j, applied uponthe upper edge of the door A when this door is shut. From the innervertical face of said nose L a lip, k, projects, which, when the door Ais shut, is caught and held down by a plate, l, on the top edge of thisdoor, as shown in iig. 1. This upper fastening may be used as a lowerfastening for blinds or shutters or desk-doors, but I prefer to use thefastening shown in figs-2 and 3 for this purpose. This fastening offigs. 2 and 3 would not be objectionable for an upper as well as a lowerfastening.

From the above description it will be seen thatI so construct a.fastening for double doors, shutters, or

blinds, that when applied to one door, and both doors closed, the otherdoor will, by means of a projecting lip l on the latch, lock this latchin place so that it cannot be picked. It will also be seen, from theabove description, that I employ spring-latches which are selfadjnsting, and which admit of the door A being readily opened or shut whenthe door A is open.

seien 2 I have described two practical modes ot" carrying my inventioninto effect, but I do not confiney myself' to the precise constructionof the devices here-in shown, :is other forms may be adopted. The gistof my invention is to have one door lock the fastening of-the other insuch manner that such fastening cannot be picked when both doors areshut. The lock and bolt-fnstenings which .ztre applied to the door A maybe constructed in :my well-known manner. v

Having described mj invention, what I olztinios new, and desire tosecure by Letters Patent, is-

1. The construction of the spring-door fastening, for the purposedescribed, with the self-adjusting latc'nngnose haring a lip or lockingprojection. formedon it, substantially as described.

2. The spring-door fastening for double doors, which, when both ldoorsare shut, .will belockedend hel firmly in place by one of the doors,substantially as described.

' DANIEL BULL.

Witnesses:

WILLIAM D. ANDREWS, JosIAn LITTLE.

